What transportation means for me to take a big musical instrument from Nanjing to Shanghai PuDong?

You are advised to take a high-speed train at NJ Train Station to Shanghai. When getting to Shanghai Train Station, find airport shuttle bus line 5 to Pudong Airport directly!

Generally, your musical instrument will be allowed to take onto the train. For the shuttle bus, if it is too large, you can put it in the luggage store trunk beneath the bus! Anyway, would you tell me the size of the instrument?